HU216009B - Helically wound reinforced ribbed composite structure - Google Patents

Abstract

Spirally wound composite tube or tubing produced by helically winding a plastic strip and interconnecting the weft threaded edges of the strip (10), from which the strip (10) comprises a thermally extending and projecting spacing extending along the width of the strip (10) to form open, thermally extending, side-by-side ducts between them, and at least some of said leather skins (15) have a flange (14) at or near the free end for stiffening said skins (15), each flange (14) from the flange on the mat skin (15) (14) is separated and there is at least one helically projecting reinforcing member (11) within the skin system between a pair of said skins (15), the effective edges of the reinforcing member (11) being connected to the edges (14) of said pair of leather, said reinforcing member (11) has a central body part with a cross-section U or V cross-section relative to the surface of the strip (10), the radial dimension of which measured from the surface of said strip (10) is larger than the radial dimension of said skins (15), so that the effective outer diameter of the composite pipe is substantially larger than the inner diameter of the pipe or pipeline. ŕ

Description

BACKGROUND OF THE INVENTION The present invention relates to the development of reinforced ribbed structures, in particular spirally wound tubes or conduits made of composite materials, reinforced or reinforced.

It is well known that plastic tubes can be produced by winding a plastic tape having a spaced set of protruding ribs extending longitudinally along the tape at room temperature or at elevated temperature, at which the plastic becomes more flexible. This form of spirally wound tube is well known in the art and is disclosed in the same inventive patents for the plastic tape as well as the machine for making a wire or tube from plastic tape.

For heavy-duty applications, the plastic strap and ribs must be large enough to achieve adequate strength, or the finished pipes or wires may be reinforced with reinforcing or reinforcing elements.

In this regard, reference is made to Applicant's Australian Patent No. 607,431, which discloses a method for making a reinforced plastic tube by inserting a reinforcing member between the ribs so as to substantially increase the bending resistance of the finished wire or tube.

The reinforcing member is a U-shaped metal strip whose free ends are configured to engage beneath the opposite edges of a pair of adjacent ribs, thereby securing the reinforcing member between the ribs, thereby reinforcing the ribs and the finished tube. As described in the above-mentioned patent, the strength of the pipe or conduit is particularly important in applications where the reinforced pipe or conduit is buried or subjected to high ground pressure.

The object of the present invention is to improve reinforced spirally wound plastic tubes or conduits, including those mentioned in the aforementioned Australian Patent No. 607,431, which increases the stiffness of the tube or conduit by adding recycled, inexpensive plastic and metal (or both) reinforcing elements, to form a composite plastic structure in this way.

It is a further object of the present invention to provide a spirally wound plastic tube formed of two materials having different characteristics, such that the tube or conduit produced or produced has improved properties and can be manufactured at a relatively low cost.

An embodiment of the present invention is a helical or helically wound composite tube or conduit formed by spirally wounding a plastic strip and bonding adjacent edges of adjacent threads of the strip, wherein the strip comprises a longitudinally spaced rib, spaced apart along its width, between them form open, longitudinally extending adjacent channels. At least a few ribs are provided at or near the free end of the ribs, each of which is separated from the edges of any adjacent rib, with at least one non-planar elongated spiral reinforcing member, at the edge edges of the reinforcing member. engaging with a flange of ribs of a pair of ribs, the reinforcing member having an inverted U or V-shaped central body portion having a radial height greater than the height of the ribs thereby substantially increasing the effective outer diameter of the composite pipe or conduit. With this arrangement, a composite tube of extremely high rigidity can be produced.

The reinforcing member may be used to wind the tube and may be fed continuously or intermittently so that a plurality of separate helical members are disposed along the length of the coiled tube. Alternatively, the reinforcing member can be wound around one or more of the T-shaped ribs on the outer surface of the coiled tube even after the tube has been formed.

The reinforcing member is preferably a rolled metal strip.

In a further preferred embodiment, the reinforcing strip has a profile comprising an inverted V or U-shaped central body portion having outwardly divergent flanges on both sides, the free end of which flanges below the respective protruding rib edge. In another arrangement, the inverted V or U-shaped central body portion encloses at least one rib, whereby the ribbon reinforcement member is tensioned between two adjacent ribs.

In a further preferred embodiment, the ribbon reinforcing element is enclosed in a flexible or plastic casing or coating, for example, by extrusion of plastic onto a strip made of steel, preferably or at least exposed to external stress by a plastic protective casing.

In a further preferred embodiment of the invention, at least some of the adjacent longitudinal channels are filled with a reinforcing and protective filler, which may be made of recycled plastic (compatible with the plastic tape) or a combination of plastic and fiber. The filler may be applied to the conductor in a molten form when the conductor exits the spirally winding machine so that the molten material engages the outer surface of the spirally formed conductor and / or the ribbon reinforcement.

Alternatively, the filler may be applied in a net-like manner by extrusion, which extends to the outer surfaces of the rib edges and rests on the outer surface of the reinforcing member.

In a still further preferred embodiment of the invention, a recycled plastic cover strip extends on the tape reinforcement member, with the same extent as the edges of the cover strip being formed with edge portions for attachment to the rib edges. The top member provides some additional stiffness to the finished pipe or pipe.

In the case of reinforced composite pipe or conduit used for re-lining submerged sewers, a properly formed reinforcement may contribute to the failure of the liner pipe2.

EN 216 009 Β so that the annular ring of the injection liner can be coaxial. Further, the steel reinforcement can stiffen the liner to such an extent that, when mortar is pressed into the space between the liner and the defective tube, the composite reinforced liner can absorb the injection pressure, while the simple, non-reinforced plastic liner has to be filled with water. Therefore, with the reinforced structure of the present invention, the insertion of the liner and the filling of the annular ring can be accomplished even during operation of the canal, which is very advantageous to the general contractor.

It is a further object of the present invention to provide an elongated plastic strip for forming hinges by spirally wounding the strip and joining adjacent edges of the threads of the strip so wrapped, wherein the strip is formed by spaced apart longitudinal ribs spaced apart at one side forming a series of longitudinally extending adjacent channels, each rib having a pair of closely spaced protruding ribs, including an outwardly opening slit cavity, the slit being formed to hold the helically wound an extension of an elongated reinforcement element applied to a wire or tube.

Preferably, the opposing inner walls of the slit cavity are provided with beards or teeth and the reinforcement member has a T-shaped cross-section, the vertical member of which is also formed with a beard, which is pressed into the slit cavity between the protruding ribs. record.

Alternatively, the free ends of the opposing members of the reinforcing member having an approximately inverted U-shaped cross-section are secured in the slit cavity of the respective rib configuration and the bridge portion of the reinforcing member is disposed outside the outer surface of the ribs.

Yet another object of the present invention is to provide a spirally wound, reinforced composite tube or conduit which is subjected to a deformation process that permanently deforms the metal reinforcement member and converts the tube or conduit from a circular cross-section to a non-circular shape. a non-circular cross-sectional shape is supported by a permanently deformed metal reinforcing element which is wound around it. This provides a very simple and effective means for producing non-circular plastic tubes or conduits without the need to heat deform the plastic tape material.

In order to further illustrate the present invention, some embodiments will be described in more detail below with reference to the accompanying drawings.

1 is a front view of a reinforced wire according to a first embodiment of the present invention;

Figure 2 is a partial sectional view of the wire of Figure 1;

3-5. Figure 3 is a partial sectional view of a further embodiment of the invention;

Figures 6 and 7 are partial sectional views of two further embodiments of the invention, each rib being formed as a female member on the plastic strip;

8a. and 8b. Fig. 9a shows a plastic strip where the ribs are deformed during the winding process and form loops that secure the free edges of the reinforcing member, while Fig. 9a is a diagram. 9b and 9b. 2 shows non-circular cross-sectional tubes formed by deformation of the composite tube or conduit of FIGS. 1 and 2 such that the metal reinforcement member is permanently deformed.

1 and 2, there is shown a spirally wound composite conductor having a plastic ribbed rib 10 and a metal reinforcement 11 arranged between a pair of adjacent T-ribs 15 of the rib 10 and at the free end of the ribs 15; formed by the connection of the formed flange 14 and the edges of the reinforcing element 11. All reinforcing elements are formed from a roll of metal strip and have an approximately W-shaped cross section, the reinforcing element 11 having an inverted V-shaped central body portion extending over the widening end of the ribs 15, thereby increasing the effective outer diameter of the coiled tube. This greatly stiffens the pipe and makes it suitable for applications where the pipe is subjected to internal and external forces that would otherwise deform the pipe wall, such as underground applications where the pipe is buried.

Referring to Figure 3, which is a front sectional view, a commercially available strip 10 commonly used for making a spirally wound tube or conduit is shown in combination with a reinforcing member 11 enclosed by a wrapping strip 12. All reinforcing elements are again rolled of steel strip and have an approximately V cross section. The reinforcing element 11 has an inverted U or V-shaped central body portion extending radially from the edges 14 formed at the upper end of the protruding ribs 15. This arrangement results in a high degree of stiffness of the finished wire. The sides of the reinforcement member 11 are curved outward and form outwardly diverging edges 17, each extending from the underside of the flanges 14 to the base wall 18 of the strip 10. In this arrangement, the reinforcing element 11 is positioned between a pair of adjacent ribs 15 of the spirally wound tube being made, and is generally provided in the space between the ribs 15 for fixing therebetween.

In this embodiment, the wrapping tape 12 is made of recycled plastic and is formed with a central hammer part 20 which fits snugly against the upper edge of the central body portion of the reinforcing element 11, and the wrapping tape 12 .

If necessary, the cavities between the wrapping strip 12 and the reinforcement member 11 may be filled with filler material 12

Prior to the wrapping of the collar, such filler must be compatible with the material of the collar and the collar. The filler can also be designed to provide additional strength and protection.

It should be noted that it is also possible to place only the wrapping strip 12 on the outer wall of the spirally wound wire 10 made of plastic tape 10 and thus without the reinforcing element 11, which is shown in FIGS. FIG. 6A provides lower stiffness and bending resistance than the design of FIG. The cap portion 20 forms a stiffening rib in the wrapping strip 12 which, when placed on the ribs 15, increases the bending strength of the finished tube. Also, filler material may be applied between the ribs 15 prior to winding the wrapping tape 12.

As shown in Fig. 4, the second metal reinforcing element 19 encloses a pair of ribs 15 and significantly reinforces the composite tube, since the radial height of the second reinforcing element 19 is substantially greater than the ribs 15.

The arrangement shown in Fig. 5 is similar to that of Fig. 1, but the third reinforcing member 21 is configured to extend between a pair of non-adjacent ribs 15, the third reinforcing member 21 being dimensioned to include a U or V central body portion. intermediate 15 ribs. The reinforcing element 11 and the third reinforcing element 21 have the property of effectively increasing the outer diameter of the completed pipe or conduit and substantially increasing its stiffness.

The third reinforcing element 21 may also be encapsulated in plastic to form a plastic-coated tape, which may be made of rolled steel and recycled plastic.

The process for manufacturing a reinforced tube or conduit is substantially the same as that described and illustrated in the aforementioned Australian Patent 607,431, which is incorporated herein by reference. The metal strip reinforcing element 11 and the third reinforcing element 21 and / or the plastic wrapping tape are preferably applied to the coiled tube when exiting the coiling machine, but the mode of application can be widely varied by continuously or intermittently feeding the reinforcing element 11, the hood portion 20 and the third reinforcing element. It will also be immediately appreciated that the adjacent edges of the threads of the tape 10 may be joined by a separate fastening or connecting tape which is fed into the winding machine together with the plastic tape 10, rather than by integrally formed connecting elements at the opposite edges of the tape 10.

Figure 6 shows a second strip 25 having longitudinally extending protruding ribs 26 spaced apart along the width of the rib, each rib 26 comprising a pair of first ribs 26 'and second ribs 26' arranged so longitudinally they form an extensive 27 cavities which open outwards. The first rib 26 'and the second rib 26' are formed with longitudinal beards 28. A T-shaped fourth reinforcing element 29 has a bearded projection 30 extending from the roof wall 31, the bearded projection 30 being pressed into the cavity 27 during tube or pipe manufacture and held tight by the engagement of the beards. Again, the fourth reinforcing element 29 is used when the spirally wound tube or conduit exits the winding machine, however, as described above, this can be accomplished in a number of different ways well known to those skilled in the art.

In the embodiment of FIG. 7, the second strip 25 is the same as that of FIG. 5, but in this case the profile of the fifth reinforcing member 32, which may be formed of rolled steel or fibrous material, is inverted. 27 are fixed in their cavities. In order to secure the fifth reinforcing members 32 in the cavities 27, the opposite ends of the fifth reinforcing members 32 may be serrated or expanded. Again, the cavity between the inner surface of the fifth reinforcing element 32 and the outer surface of the second ribbon 25 may be filled with recycled plastic filler.

8a. and 8b. 3 to 4, the third strip 34 is formed with protruding second ribs 35, each second rib 35 comprising a pair of closely spaced vertical ribs 36, each of which has a predetermined bending point, with a reduced cross-section between its upper and lower ends. After the winding operation, the vertical ribs 36 are shown in FIG. 1 to 3, such that a loop is formed at its upper end. The loop configuration 37 provides a fixed retention of the sixth reinforcing member 38, as described in Figure 1, adjacent to the vertical ribs 36 of adjacent second ribs 35.

9a. 9b and 9b. 1 to 4, the reinforced spirally wound plastic tube of Figure 1 is subjected to a deformation process such that the tube 40 is of a non-circular cross-section, e.g., oval or rectangular, with the additional reinforcing member 41 extending beyond the metal elastic limit. has been used.

The spirally wound plastic strip 42 is supported by a non-circular cross-section of a continuously deformed metal reinforcing member 41 disposed around its outer wall. The shape of the composite tube takes the shape of the additional reinforcing member 41 without the thermoplastic material forming the tube having to be deformed.

The deformation process can be carried out by applying the crushing force to the outer surface of the circular cross-sectional tube or pipe or by applying an internal tension force by crushing geometrically opposed portions of the pipe. In the case of compressive force, the conduit is simply pressed against parallel opposed plates to permanently deform the spiral reinforcement member to a shape other than a circular cross-section, such as an oval, whereby the plastic strip 42 forming the tube remains in the same shape.

HU 216 009 Β

Alternatively, opposing steel shapes are placed in the unformed tube or conduit and extended to contact the transverse portions of the conduit. The formers are then removed from one another, for example by means of a hydraulic jack, to extend or widen the wire to a shape other than a circular cross-section, while at the same time permanently deforming the additional reinforcing member 41. After stretching and tensioning, the tube 40 is permanently non-circular in shape.

If an egg shape is desired, the formers may comprise curved plate-like members having different curvature such that, when sufficiently removed to deform the additional reinforcing member 41, the composite tube 40 will have an egg-shaped cross section. It will be appreciated that a variety of shapes can be provided, such as tapered tubes and tube ends with bell-shaped sockets for taper connection to other tubes.

Further, an oval tube or conduit can be split lengthwise to form two channels that are rigid enough and can be used for channels, leaks, to name just a few applications.

A brief study of the embodiments described above indicates that the composite plastic tube of the present invention has superior properties and variability in stiffness, and due to its low weight and high strength, it is ideally suited to a wide range of industrial and commercial applications.

Claims (13)

PATENT CLAIMS 1. A spirally wound composite tube or conduit formed by spirally wounding a plastic tape and interconnecting adjacent edges of the adjacent threads of the tape, the tape comprising a longitudinally extending and protruding rib system spaced longitudinally along the width of the tape, and forming at least a plurality of said ribs at or near the free end of said ribs for stiffening said ribs, each edge being separated from its adjacent rib and having at least one helically protruding reinforcement within one of said ribs; between its pairs, the boundary edges of the reinforcing element are connected to the edges of said pair of ribs, characterized in that said reinforcing element (11, 19, 21) has a pivoting surface relative to the surface of the strip (10). tt a central body part having a U or V cross-section, the radial dimension of which is greater than the radial dimension of said ribs (15), so that the effective outer diameter of the composite tube is larger than the inner diameter of the tube or pipe. Spirally wound composite tube or pipe according to claim 1, characterized in that said reinforcing element (11, 19, 21) is continuous and has the same length as the spirally wound strip (10). Spirally wound composite tube or pipe according to any one of claims 1 or 2, characterized in that the reinforcing element (11, 19, 21) is a rolled metal strip. 4. A spirally wound composite tube or conduit as claimed in any one of claims 1 to 6, characterized in that the reinforcing element (11, 19, 21) has a V or U-shaped central body portion having outwardly diverging edges on each side, said free ends having respective ends the protruding rib (15) is connected below the flange (14). 5. A spirally wound composite tube or conduit as claimed in any one of claims 1 to 5, characterized in that the inverted V or U-shaped central body portion bridges at least one rib (15), whereby the ribbon reinforcing member (11, 19, 21) is at least adjacent to the ribs (15). is stretched between. 6. A spirally wound composite tube or pipe according to any one of claims 1 to 3, characterized in that the reinforcing element (11, 19, 21) is resilient and / or wrapped in plastic. 7. A spirally wound composite tube or pipe according to any one of claims 1 to 4, characterized in that an elongated wrapping strip (12) is arranged on the reinforcing element (11, 19, 21) of equal length, the wrapping strip (12) having edge portions with the flanges (14). in locking connection. Spirally wound composite tube or tubing according to claim 7, characterized in that the wrapping strip (12) has a central cap portion (20) adjacent to the central body portion of the reinforcing member (11, 19, 21). 9. A spirally wound composite tube or pipe according to any one of claims 1 to 4, characterized in that the wrapping strip (12) is made of recycled plastic. A reinforced tubular structure comprising a tube formed by helically winding a plastic tape and seam adjacent edges of the tape threads, characterized in that the tape comprises a plurality of longitudinally extending ribs (26) spaced at least one side along the width of the tape. forming a series of openly extending longitudinally extending adjacent channels, each rib configuration (26) comprises two opposing protruding ribs (26 ', 26') forming an outwardly facing slit cavity (27); a spiral elongate reinforcing member (29) being wound around the spirally wound web having a foot portion (30) locked in the slot-like cavity. The reinforced tubular structure of claim 10, wherein the opposed inner walls of the slot-like cavity (27) are provided with beards or teeth. A reinforced tubular structure according to any one of claims 10 or 11, characterized in that the reinforcing member is a T-section, the vertical member or foot portion (30) of which is preferably provided with a beard, A vertical member or leg portion (30) is pressed into the slit cavity (27) to secure the reinforcement member (29) to the outer wall of the tube. Pipe structure according to any one of claims 10 or 11, characterized in that the reinforcing element (32) is approximately inverted U, the free ends of the reinforcing element (32) being locked in the respective slit cavities (27) of adjacent ribs (2, 6). fixed, the bridge portion of the reinforcement member (32) extending from the end surfaces of the ribs 5 are arranged radially outward.